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2 * 3 + 1 = 7 y se pone el mismo denominador
ahora saco el paréntesis
- 2 + 1/3 - 4/5 + 7/2 = 31/30
- 2 + 1 - 4 + 7 - 60 + 10 - 24 + 105 31
------------------ = ---------------------------- = ------
30 30 30
saludos